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| File information | |
| Filename: | us0d0007493-001.jpg |
| Keywords: | Pittsburg / Pennsylvania / Allegheny / William F. Robb / John M. Robb |
| Inventor's Name: | Augustus H. Heisey |
| Patent Date: | June 16, 1874 |
| Pattern Name/Number: | Unknown |
| Original Manufacturer: | Unknown |
| Date added: | Apr 21, 2019 |